Re: [PATCH RESEND] ARM: OMAP3: USB: Fix the EHCI ULPI PHY reset issue

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On Wed, May 2, 2012 at 3:38 AM, Raja, Govindraj <govindraj.raja@xxxxxx> wrote:
> On Wed, May 2, 2012 at 2:17 PM, Russ Dill <Russ.Dill@xxxxxx> wrote:
>> On Mon, Mar 19, 2012 at 6:34 AM, Raja, Govindraj <govindraj.raja@xxxxxx> wrote:
>>> On Mon, Mar 19, 2012 at 12:12 PM, Keshava Munegowda
>>> <keshava_mgowda@xxxxxx> wrote:
>>>> From: Keshava Munegowda <Keshava_mgowda@xxxxxx>
>>>> It is observed that the echi ports of 3430 sdp board
>>>> are not working due to the random timing of programming
>>>> the associated GPIOs of the ULPI PHYs of the EHCI for reset.
>>>> If the PHYs are reset at during usbhs core driver, host ports will
>>>> not work because EHCI driver is loaded after the resetting PHYs.
>>>> The PHYs should be in reset state while initializing the EHCI
>>>> controller.
>>>> The code which does the GPIO pins associated with the PHYs
>>>> are programmed to reset is moved from the USB host core driver
>>>> to EHCI driver.
>>> I tested on beagle xm where gpio nreset is requested from
>>> board file.
>>> (Basic enumertaion after gpio nreset seems to work fine,
>>> Hub and smsc lan chip get detected afetr boot up)
>> What base did you test this on top of? my xM is failing USB-wise when
>> I apply this on v3.3.3 (with the UART mux fix patch) and where it is
>> applied within master (3.4-rc4, again, with the UART mux fix patch).
>> Additionally, reverting this patch from 3.4-rc5 causes rc5 to work
>> properly.
> Works for me be on 3.4-rc5 Beagle-XM even without reverting the patch
> Logs as in here [1].
> --
> Thanks,
> Govindraj.R
> [1]:

I've tracked down the difference. I'm loading my uEnv.txt and uImage
in u-boot from the network which means initializing USB. You are
loading straight from MMC. If I switch to loading straight from MMC
everything works.

Can everyone do a 'usb start' in u-boot before booting and re-test?
I'm pretty sure this is a regression, but the bug could be a strange
u-boot/kernel interaction.
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